Scratcher or scraper for stirring apparatus in sulfate-furnaces.



H. EMRIGH.

SCRATGHER OR SORAPER FOR STIRRING APPARATUS IN SULFATE FURNACES.

APPLICATION FILED AUG. 22, 1913.

LWLQM. Patented Dec. 15, 1911.

31mm or am-Mucous 6. Um, I m w.DMWJ 1 ankle/W5 properties of being nmivnlon: nnnion, or Hoons'r-on- VORM. nnrsrnninoxus a PonATioN 0F GERMANY.

SCRATCHER OR SGR-APER FOE Ii-MAIN, GERMANY, ASSIGNOR TO FARB'WERKIE OF HGCHST-ON-THE-MAIN, GERMANY, A COR- STIRBING APPARATUS IN SULFATE-FURNACES.

Specification of Letters Patent.

Patented Dec. 15, 19141.

Application filed August 22, 1913. Serial No. 786,204.

To all whom it may concern Be it known that I, HEINRICH EMRIOH, engineer, a citizen of the Empire of Germany, residing at llochst-on-the-Main, Germany, have'invented certain new and useful Improvements in. Scratchers or Scrapers for Stirring Apparatus in Sulfate-Furnaces, of which the following is a specification.

In the chemical industry the resisting power of the plant is of great importance in regard to the economy of the technical processes. Thus, in the manufacture of acids a great part of the expenses is caused by the considerable wearing out of the implements of the furnaces, the stirrers, scratchers and the like. Moreover, the efliciency of the furnaces that ha e been hitherto employed in the manufacture of sulfate has been dependent on the resisting power of the parts of the plant mostly attacked by the acids and the high temperature, namely the scratchers. particularly quickly worn out in the calcination stage, in consequence of which the sul-' fate crust on the hearth soon accumulates to such a thickness that it fails to conduct the heat sufliciently, so that the furnace becomes unproductive and has to be put out of action for the removal of the crust and for repairs. In all text-books dealing with inorganic chemical industry there is repetition of complaints about the Wear and life of the scrapers and scratchers in said furnaces. The many attempts to reduce the Wear and prolong the life of such parts have been unsuccessful.

The present invention has for its object to remedy these drawbacks by using an aci dresisting and fireproof'stone substance for making the scratchcrs or scrapers employed' stirring of the mass durin the Working or mg the reaction. stoneware materials For this purpose all having; the particular hard burnt, fireproof and acid-resisting may be used. The acid resisting power possessed. by certain kinds of stoneis generally known, but the idea of utilizing this property in the making of the parts referred to is ntirely'novel, and the possibility of its use for this purpose could not be foreseen.

this invention and The metallic scrapers are.

prising a Apart from the fact that in no publicat1on has any proposal been made to use any stone substance for the scratchers and scrapers, not one of the many makers has conceived the advantage of using therein scratchers made of stone material. Furthermore, the manufacturers who are already working with such furnaces for tens of years and, therefore, know their deficiencies, would certainly have availed themselves of put it into practice.

y using in sulfate furnaces, stirrers, scratchers, scrape s or the like made of fire proof and acid-resisting stone substance, the period during which such furnaces keep in good working order is greatly prolonged. This means a very considerable technical advance, because tho-time that would be otherwise necessary for cooling, cleansing and repairing the furnace is saved, and moreover, as every manufacturer knows, frequent interruptions in the working involve short durability of the whole plant.

In the accompanying drawing illustrating one embodiment of the invention-Figure 1 shows in elevation one end of a scraper arm in operative position; Fig. 2 is an elevation of the same, partly in section, on line of Fig. 1; and l ig. 3 is a plan view of the scraper and frame detached from the arm.

In said drawings, the scraper 1 of acidresisting stone, is of chisel form and mounted in a frame 2, being secured thereto by a wedge 3. The frame 2 is connected. in any suitable manner to the arm 4 of the sti ring apparatus, the securing means chosrr for illustration comprising a cap-plate 5 ar a. bolt 6. The scraper thus made of sieac absolutely prevents the accumulation c. sulfate crust on the hearth of the furnace.

The word scraper as'used in the claims is to be understood as including like elements, as stirrers, etc.

It will be observed that in this construction the stones are so mounted as to permit the direct replacementof any individual stones, without removal of "others.

Having now described my invention, what I claim is: A i

1. In a sulfate furnace, a scraper com;- sohd, acid resisting, fireproof,

shaped stone, in combination With attaching means therefor, said attaching paeans constructed to permit the direct replacement of the stone.

2. In a sulfate furnace, a scraper comprising a plurality of solid, acid-resisting, fireproof, shaped stones, in combination with attaching means therefor, said attaching means constructed to permit the direct replacement of the individual stones.

In testimony whereof I affix my signature in presence of two Witnesses.

HEINRICH EMRICH. Witnesses WILLIAM DAWSON, J12, CARL GRUND. 

